Answer: D) 2.6 g of solute in 2 ml of solution Explanation: A concentrated solution will contain the most solute molecules per solvent molecules. Here in the given options, 1)  6/10 = 0.6 2) 20.5/50 = 0.41 3) 30/120 = 0.25 4) 2.6/2 = 1.3   Hence, option D) is most concentrated.

Answer: D) All of the above Explanation:

'M' is used as a unit of molarity and stands for mole per litre i.e, number of moles of solute per liter of solution.

Answer: C) 117 Explanation: Number of square units in 13 by 9 is given by the area it forms with length and breadth as 13 & 9 Area = 13 x 9 = 117   Hence, number of square units in 13 by 9 is 117 sq.units.

Answer: C) use the same grammatical construction in all similar headings throughout an outline. Explanation:

Answer: A) transmitted to progeny Explanation: The best example for somatic mutation would be cancer, familial cancer (which transmits through gametes to the next generation) are not so common while sporadic cancer is seen the most where body cells of a particular area goes through mutations for a number of years and becomes cancerous, but it is not transmitted to next generation.

Answer: D) All of the above Explanation: Any of the above given options can be a reason for the damage of the relationship of a couple or a two families or two friends etc... Without trust relationship cannot be maintained, people not spending time with one another or without meeting the expectations of the opponents can also damage the relationship.

The Earth has four major systems or spheres. These systems are  1. The geosphere,  2. The hydrosphere,  3. The atmosphere, and  4. The biosphere.   The biosphere is the system where we belong.